I am using KDE. i recently switch to zshell, i added this line 'source /etc/profile' to my zshrc file. when my system is booted to KDE (through kdm), i cannot execute some programs like firefox, etc through kde. like if i open a kde run command dialouge and type firefox in it, it says Could not find 'firefox' executable. althouth the $PATH variable shows the path of mozilla firefox bin directory and i could run it from within my terminal. all my kde menubar shortcuts no longer work whose paths have been set via /etc/profile.d/* scripts. it worked fine before i switched to zsh. i was using bash btw and again when i change my shell to bash, relogin it again works fine.